can not update to ios 15.4.1
Tried by mobile data, changed wifi, changed time zone to auto, restarted iphone, tried itunes says error 4000. I require assistance about this issue.
Restart your computer and do a forced restart on your phone, then try it again.
forced restart.
• Press and quickly release the volume up button
• Press and quickly release the volume down button
• Press and hold the side button.
• When the Apple logo appears, release the button.
Force restart iPhone - Apple Support (IN)